Roger Stone's lawyer on Friday clashed with a key witness in the longtime Trump adviser's trial over charges of lying to Congress. During a heated cross-examination, Stone's lawyer questioned the credibility of radio host and political activist Randy Credico, with the judge at numerous times intervening. Stone is accused of lying to lawmakers about his claims of having an intermediary with WikiLeaks as the organization was preparing to release stolen emails from Democratic presidential nominee Hillary Clinton's campaign in 2016. He told the House Intelligence Committee in 2017 that Credico was his back channel to WikiLeaks. Credico has denied having...